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image above illustrates a section of the Motorhome floor. A plywood
sheet top and bottom with Polystyrene in between. It also has timber
battens to increase strength.

This construction method makes for a strong and very light build
required in the Motorhome. Any extra weight is the weight removed
from the Motorhome owner's carrying capacity. The construction
method has a problem! after years of walking over it the polystyrene
compresses, leaving the plywood to move up and down, thereby
increasing the damage and weakening the floor structure.

The only answer is to fill the gap between the compressed
polystyrene and the plywood. There are 'Packs' available from
Motorhome repair dealers to enable the experienced DIY man to carry
out a repair.

Recently with this problem, I have decided to leave the job to an
experienced caravan repair shop, as the floor damage was in the
section from the entry door, in a large circle.

So if you have a spongy section in your floor, get it repaired as
soon as possible.

The test method used by my repair man was to walk on his heals,
gently, the floor could then be seen moving up and down.

LPG
Gas Locker

Here
is advise I gave to a query from an email response:

For
a repair I would take the easy route, which wont disturb any
fittings of the LPG locker.This
would be my way. Buy a 15 to 20 mm deep plywood, I say deep so
the repair screws, that will go into its sides, will grip it tightly
all around. [ You will lose that amount of space internally.]Get
your DIY shop to cut the plywood to the internal measurements of the
LPG locker. This will save repair time.

Place
this piece into the locker floor. leaving the original in place and
undisturbed. You will have to cut out the gas relief hole as per the
original fitted. If there is an aluminium plate fitted to the floor,
you could try and take it out and place it on top of the new piece.
If it is too awkward to remove, don't worry you can place a new piece
of aluminium on top of the plywood you are fitting.

Using
long screws, screw from the outside into the internal new
plywood. I would place one every two inches all around.

When
you have done that, get a long piece of aluminium plate, the width
of the locker. Doesn't have to be accurate. This will be fitted down
the outside of one wall, under the locker base, and up the other side
wall. Screw this U plate to the top of the locker walls each side. Or
any where it is convenient to get a screwdriver in. At the
bottom screw into the SIDE of the new plywood piece. on each side.
Secure the aluminium base with some screws, long enough to go
into the new plywood piece bottom.

As
the screws might come through into the aluminium walls internally,
this could cause scratched hands when manipulating the gas bottles,
don't worry use bolts instead and keep them short so they don't
protrude to far into the locker, or use screws which have no points.
having drilled suitable holes first.

If
the top of the locker walls are in good condition, this will take
any weight in the LPG bottle locker, at least to the original specification.

Having
done that get some wood renovator preservative. This really does
renovate by being absorbed. paint all around and into all cracks of
the locker. Come to think about it perhaps this should be done first!

If
the locker is beyond the work I have advised then you must take it
to caravan dealer and get him to use his expertise to do a rebuild.